Department of Chemistry, Aligarh Muslim University, Aligarh-202 002 Manuscript received 4 July 1989, revised 18 July 1991, accepted 3 September 1991 Characterisation of tin compounds (Kushta Qalai) used In Unani medicine has been carried out in walpole buffer and Britton-Robinson buffer by differential pulse polarography. These results show that the tin compounds give characteristic differential pulse polarographic peaks in walpole buffer and exist in stannous form. The colorimetric studies were also performed for the estimation of solubility of tin In walpole buffer.